0,10
Alois P. Heinz, Table of n, a(n) for n = 0..14
Wikipedia, Hypergraph
Column k=9 of A309858.
Sequence in context: A230229 A027736 A301638 * A110982 A079331 A265490
Adjacent sequences: A309860 A309861 A309862 * A309864 A309865 A309866
nonn
Alois P. Heinz, Aug 20 2019
approved